Duplicating machine



Aug. 24, 1937. R. F. MORRISON ET AL 2,090,849

DUPLICATING MACHINE Filed Nov. 16, 1954 a Sheets-Sheet 1 Jfobe; 6[7/2/01 1 024 Q 5 KIT/y! Aug. 24, 1937. R. F. MORRISON ET AL DUPLICATING MACHINE 8 Shets-Sheet 2 Filed Nov. 16. 1954 Jihrwm Aug. 24, 1937.-R. F. MORRISON ET AL 2,090,849

DUPLICATING MACHINE Filed Nov. 16, 1954 I 8 Sheets- Sheet s Aug. 24,1937. R. F. MORRISON ET AL DUPLICATII IG MACHINE Filed Nov. 16, 1934 8Sheets-Shet 4 1937. R. F. MORRISON ET AL 2,090,849

DUPLI CATING MACHINE Filed Nov. 16, 1934 8 Sheets-Sheet 5 Fgtqi wring,

g- ;"1937. R. F. MORRISON ET AL 2,090,849

DUELICATING MACHINE Filed Nov. 16, 1934 8 Shets-Sheet e Aug. 24, 1937.R. F. MORRISON ET AL DUPLICATING MACHINE Filed Nov. 16, 1954 8Sheets-Sheet 7 J MI R. F. MORRISON ET AL x 07 mi Z (w m M DUPLiCATINGMACHINE Filed Nov. 16, 1934 Aug. 24, 1937.

' Patented Aug. 24, 1937 OFFICE DUPLICATING MACHINE Robert F. Morrison,

Oak Park, and Merritt G.

Stewart, Chicago, Ill., assignors to Ditto, Incorporated, Chicago,Virginia a corporation of West Application November 16, 1934, Serial No.753,336

12 Claims.

be duplicated on the copy sheet.

10 The master sheets are generally made by placing a piece of carbonpaper against the back surface of a sheet of paper and then the data tobe duplicated is typed or written on the front surface of the mastersheet so that it appears in re- 13 verse upon the back surface of themaster sheet.

Of course, it is not necessary to havethe data appear on the frontsurface of the master sheet and therefore, it. is not ribbon in thetypewriter 20 eration.

necessary to employ. a during the typing op- In practice, volatilesolvents, such as alcohol,

are employed. The solvent may be applied to the copy sheets in anysuitable manner such as, for instance, by a wick through which thesolvent 25 travels from a reservoir. I

One form of the invention is embodied in a against the master sheetsduring the duplicating Means is provided for bringing the 35 duplicatingdrum to a'positive stop at the end of each cycle of operations. Theoperator may continue to operate mechanism for rotating the during apredetermined portion of the cycle of 4 operations and this facilitatesthe task of advancing the copy sheets to the duplicating drum andinsures that accurate margins will be maintained at the forward ends ofthe copy sheets. The improved machine comprises moistening means whichis brought, into engagement with the platen roller, the moistening meansbeing adapted to apply a thin film of the solvent to that surface ofeach copy 0 sheet which contacts the data on the master sheet. Otherfeatures and advantages'of the inventionwill become apparent as thefollowingdetailed description progresses, reference being had 3 to theaccompanying drawings, wherein- :wa11 37 and discs Fig. 1 is a plan viewof a duplicating machine which embodies the invention.

Fig. 2 is a section taken on line 2-2 of Fig. 1.

Fig. 3 is an enlarged section taken on line 3-3 of Fig. l. Fig. 4 is asection taken on the same line but showing some parts of the machine inchanged positions.

Fig. 5 is .a fragmentary plan view of a part of the mechanism shown inFig. 4.

Fig. 6 is a section taken on line 6-6 of Fig. 8. Fig. 7 is a fragmentarysection taken on line 1-1 of Fig. 6. t

Fig. 8 is a section taken on line 8-38 of Fig. 6. .Fig. 9 is a sectiontaken on the same line as Fig. 8 but showing certain parts of themachine in changed positions.

Fig. 10 is a fragmentary front elevation, a portion of aguard memberbeing broken away.

Fig. 11 is a fragmentary section taken on line H-H of Fig. 1.

Fig. 12 is a section taken on line l2l2 of Fig. 11.

Fig. 13 is a section taken on line l3 l3 of Fig. 10, and

Fig. 14 is a section taken on the same line as Fig. 13 but showingcertain parts of the machine in changed positions.

Referring to the drawings wherein a preferred embodiment of theinvention is disclosed, the

reference characters and 2| designate two side frames adapted to restupon any suitable support, the side frames 20 and 2| being provided withrubber feet 23 which rest upon the support. Interposed between the sideframes 20 and 2! and rigidly secured thereto are brackets 24 and 25(Fig. 2).

Projecting through the frames 20 and 2| are bolts 26 and 21,respectively, the inner ends of which are of reduced diameter asindicated at and support Rotatably journaled. on the shaft 30 is aduplicating cylinder or drum 32 provided. with hubs 33. Roller bearings34 are interposed between the shaft 30 and the hubs 33 It will be notedthat packing 35 is provided in the hubs 33 to prevent loss of lubricantfrom the roller. bearings 34.

The drum 32 is fabricated from a cylindrical 38 and 39, the hubs 33being preferably formed integral with the discs 38 and 39. a f'Referring to Fig. 6, it will be noted'that the 2 largest end of thebolt 26 projects through the frame 28 and through a spacing collar 48disposed adjacent the inner surface of the frame 28. The larger portionof the bolt 26 terminates 5 flush with the inner surface of the collar48. The adjacent end of the shaft'38 is also substantially flush withthe inner end of the collar 48. Referring now to Fig. 11, it will benoted that the larger portion of the bolt 21 extends through a sleeve 42which has one end disposed within the frame 2I. The larger the bolt 21terminates at the inner end of the sleeve 42. The adjacent end of theshaft 38 also terminates substantially flush with the inner end of thesleeve 42.- The inner end of the sleeve 42 is provided with an outwardlyextending annular flange 43. Disposed around the sleeve 42 andinterposed between the flange 43 and a collar 44 is a bushing 45 onwhich a sleeve 28 4,6 is rotatably, journaled. A gear 48 formed integralwith the sleeve 46 meshes with a pinion 49 mounted upon a shaft 58 whichis rotatably journaled in the frame 2|. The inner end of the sleeve 46is provided with-an integral annular flange 52 and projecting from theinner surface of the flange 52 are two diametrically disposed lugs 54(Figs. 11 and 13). The lugs 54 project into slots 55 formed in a hub 58of a lever 59. The hub 58 is pivotally mounted on one end of theadjacent hub 33: The free end of the lever 59 is slotted as at 68 andtheslot 68 accommodates a bolt 6I which is screw threaded into a boss 63formed integral with the disc 39 (Figs. 11 and 13). It will be readilyunderstood that the sleeve 46 can drive the lever 59 through the mediumof the lugs 54 and that the lever 59 will, in turn, rotate the drum 32through the medium of the bolt 6I. It will also be readily understoodthat the drum 32 can be angularly adjusted with respect to the lever 59.This-adjustment may be made by loosening the bolt 6|, moving the drumrelative to the lever and then tightening the'bolt. The purpose of thisconstruction willpresently appear.

Riveted to theinner surface of'the annular flange 52 is a disc 18 whichis provided atits periphery with a shoulder or tooth 12 which isengageable by a dog 14 carried by an arm 15 of a bell crank lever '16which also .comprises an 0 arm 18. As best shown in Fig. 10, the dog 14is spaced from the arm 15, the dog 14 being secured to the arm 15 byrivets 88 and being spaced therefrom by sleeves 8I. The lever 16 ispivoted on a pin 83 which projects from the inner side of the frame 2I.A spring 85 tends to displace the lever 16 in a counter-clockwisedirection (Fig. 13). One end ofthe spring 85 is secured to the lever 16and the other end is secured to a pin 86 which projects from the 0 frame2I.

provided with a roller 81 at its free end, which roller- 81 isengageable by a cam -88 pinned to the inner end of the shaft 58.

Referring to Figs. 18 to 12, inclusive, it will be noted that the piniontwo diametrically disposed slots 49b. A pin 58a projectingthrough theshaft 58 has its ends disposed in the slots 49b. The slots 4% and '.hepin 58a are of such proportion that they permit relative angulardisplacement between the shaft 58 and the pinion 49. In this instance,the shaft 58 may be displaced angularly a distance of 17 degrees in acounter-clockwise direction (Fig. 12) before the pin 58a will drive thepinion 49.

diameter of It will be noted that the arm 15 is 49 has a boss 49a withThe shaft 58 is provided with a crank or handle 92 whereby it may berotated by the operator.

Disposed around the shaft 58 and having its ends secured to the cam 88and to the boss 49a is a torsion spring 98 which tends to rotate theshaft 58 in a clockwise direction (Fig. 12) to bring the pin 58a and theslots 49b into the relative positions wherein they are illustrated inFig. 12. The drum 32 is then in its idle or feeding position asillustrated in Fig. 13. Then when the operator rotates the shaft 58 in aclockwise direction (Fig. ,2) by means of the handle 92, the shaft willbe rotated through an angle of 17 degrees before the pin 58a drives thepinion 49. During this lost motion of 17 degrees, the dog 14 isdisengaged from the shoulder 12 so that the drum 32 is free to rotate.

Upon the completion of one revolution of the drum or two revolutions ofthe handle, the drum stops as the dog 14 again engages the shoulder 12.The handle automatically returns to an idle position through the releaseof tension on the torsion spring 98; the pin 58a returning to theposition wherein it is shown in Fig. 12.

The free end of the arm 18 in the bell crank lever 16 is connected by apivoting pin 95 to one end of a link 96 which has its other end pivotedto the free end of a lever 91, by a pin 98. The lever 91 is fixed to ashaft 99 which has its ends journaled in the frames 28 and 2I. Alsofixed to the shaft 99 is a lever I88, the free end of which isengageable with a pin I8I projecting from a lever I82 pivoted on a pinI83 projecting from the frame 28. Operatively connected to the lever I82and constrained to rotate therewith is a latch member or dog I84 adaptedto engage a lug I86 projecting from a Z-shaped bar I81 which is rivetedto a lever I88 (Figs. 8 and 14) A spring II8 tends to rotate the leverI82 and the latch member I84 in a. clockwise direction (Fig. 13) tobring the latch member I84 into engagement with the lug I86.

The lever I98 extends approximately vertically and has its lower endpivoted on a shaft I I3 which has its ends fixed in the frames 28 and2|. The upper or free end of the lever I88 is provided with ananti-friction roller II4 which is engageable by a cam surface II5provided on a. dog II6 which is pivoted by a pin I I1 to a lever I I8.The roller I I4 is also engageable under abnormal circumstances with asurface I28 provided on the dog H6. The dog H6 is yieldingly urged in acounter-clockwise direction (Fig. 9) by a spring I2I. The spring has oneend attached to the dog H6 and has its other end attached to a pin I22projecting from the lever H8. Angular displacement of the dog II6 aroundthe pin II1 in a counter-clockwise direction (Fig. 9) is limited by apin I25 which projects from the lever I I8.

It will be readily understood that when the drum 32 is rotated in aclockwise direction (Figs. 8 and 9) the cam surface II5 of the dog II6will engage the roller I I4 once during each revolution of the drum anddisplace it from the position wherein it is shown in Fig. 8 to theposition wherein it is shown in Fig. 9 so that the latch member-I84 mayengage the lug I86 as illustrated in Fig. 9. In the event the drumshould be retated in the wrong direction, the surface I28 of the dog II6will engage the roller II4 but will not displace it as the spring I2Iwill yield and permit the dog I I6 to rotate in a clockwise direction(Fig. 9) around the pin II1 so that the dog will pass by the roller II4.

It will be understood that the dog 14 '00- operates with the tooth 12 tobring the drum 32 to a complete stop each time the drum is rotatedthrough 360 degrees. If it is assumed that the apparatus is in thecondition wherein it is illustrated in Fig. 13 so that the dog 14engages the tooth 12 and holds the drum against rotation in acounter-clockwise direction (Fig. 13), it will be readily understoodthat if the handle or crank 92 is rotated to rotate the shaft 50 in aclockwise direction (Fig. 13)., the shaft .50 will rotate through 17 /2degrees before the pin 50a will drive the pinion 49. During this initialmovement of the shaft 50, the cam-88 will be displaced angularly fromthe position wherein it is shown in Fig. 13 to the position wherein itis shown in Fig. 14 so that the cam will displace the roller 81 andangularly displace the bell crank lever 16 to the position wherein it isshown in Fig. 14. This movement of the bell crank lever 16 will withdrawthe dog 14 from engagement with the tooth 12 and as the operatorcontinues to rotate the shaft 50 in' a clockwise direction (Fig. 13) thedrum 32 will rotate in a counter-clockwise di rection (Fig. 14) It willbe noted that when the bell crank lever 16 is displaced from theposition wherein it is shown in Fig. 13 to the position wherein it isshown in Fig. 14 the link 96 acting through the lever 91displaces thelever I00 in a clockwise direction (Figs. 13 and 14) so that the leverI00 acting through the pin IM and the lever I02 disengages the pawl I04from the lug I06 and permits the lever I08 to be displaced from theposition wherein it is shown in Fig. 13 to the position wherein it isshown in Fig. 14. This movement of the lever I08 causes the moisteningmechanism hereinafter described, to function.

As described above, the master sheets, from which the copies are made,are secured to the drum 32. The mechanism for securing the master sheetsto the drum 32 preferably includes mechanism for automatically securingthe master sheets to the drum and for discharging them from the drum.

The master sheet securing mechanism preferably comprises a bar or clampwhich is designated generally by the reference character I30. The clampI30 comprises a head portion I3I and a shank portion I32, the shankportion I I32 being slidably joumaled in a slot I33 formed in a bracketI35 secured to the inner surface of the drum 32. It will be noted thatthe wall 31 of the drum 32 has a slot I31 which receives the head I3Iwhen the clamp I30 is in its functionally operative position (Fig. 7).The shank I32 is provided on one side with a longitudinally extendingrecess I38, one side of the recess being formed by an overhangingportion ofthe head I3I. This overhanging-portion is in the form of aflange; I extending longitudinally of the head l30.

In Fig. 6, the construction of the ends of the clamp I30 is illustrated.Only one end is shown in this figure but it will be readily understoodthat the other end is identical in' construction.

The ends of the clamp I30 are provided with longitudinally extendinglugs I and I42. Rollers I43 and I44 are disposed at the outer ends ofthe lugs MI and I42, respectively, the rollers I43 and I44 beingjoumaled upon pins I45 screw-threaded into the lugs MI and I42. Theroller I43 rides in a slot I46 formed in a lever I41 which is fixed to ashaft I48 extending longitudinally through the drum 32, the shaftbeing'journaled in the discs 38 and 30 (Fig. 8). The roller I44 rides ina slot formed in a lever I50 which is fixed to the shaft I48.

Referring to Figs. 8, 13 and 14, it will be noted that the lever I41 islonger than the lever I50 and that the lever I41 carries a roller I52 atits free end. The roller I52 is engageable with a cam surface I53formedon a cam member'or lever I54 which is pivoted on a pin I55projecting from the frame 20.

Returning again to the description of the clamp I30, it will be notedI51 are interposed between the lugs HI and I42 and flanges formed uponthe periphery of the that compression springs discs" 38 and 39.Thesprings I51 are held in place by pins I58 projecting from the lugs MIand I42 and by pins ter sheet is shown atv I 62.

The drum 32 is provided with means for strip ping or disengaging themaster sheets from the clamp I30. This means comprises a plurality ofpins I65. Only one ofthe pins I is shown in Fig. 6 but it will bereadily understood that the right hand end (Fig. 6) of the drum 32 isprovided with a similar pin and similar mechanism for actuating it. Thepin I65 occupies the position wherein it is shown in full lines in Fig.6 when the clamp is in the position wherein it is shown in the samefigure. However, when the clamp I30 'is displaced into the positionwherein it is shown in dotted lines in Fig. 6, the pin' I65 moves intothe position wherein it is shown in dotted lines in the same figure. Theinner end of the pin I65 is enlarged in diameter to provide a shoulderI66. The enlarged end of the pin I65 is slidably joumaled in a bore I61formed outer end of the bore I61 being of smallerdi ameter to journalthe outer end of the pin I65.

l clamp I30. The clamp I30 is provided with a slot I11. whichaccommodates the inner end of the pin I 65, the lever HI and the outerend' of the plunger or pin I 13. It will be.noted that the longitudinalaxes of the pins I65 and I13 in the clamping member I30, the.

are disposed radially with respect to the axis of rotation of the drum32.

The'inner end of the plunger or pin I13 is of smaller diameter and isscrew-threaded. Screwthreaded upon the inner end of the plunger or pinI13 is a nut I80 and a lock nut NH. The nut I80 is engageable with ahardened washer I82 which abuts against the bracket I35. The plunger orpin I13 is slidably journaled in the bracket I35.

The construction of the mechanism associated with the pin I65 is suchthat when'the clamping I member I30 moves from the position wherein itis shown in full lines in Fig. 6 to the position wherein it is shown indotted lines in the same figure, the pin I15 is displaced thesame'distance and the latter distance is preferably longer than thedistance between the opposite surfaces of the washer I82 and the nutI80. Therefore, the nut I80 abuts against the washer I82 before the pinI has reached the position wherein it is shown in dotted lines in Fig. 6and, as a result thereof, the pin I65 travels a greater distance thanthe clamp member I30. Therefore, when the clamping member I30 moves intothe position wherein it is shown in dotted lines in Fig. 6, the pin I65projects from the clamping member as illustrated in Fig. 6. Obviously,if a master sheet is adhering to the outer surface of the clampingmember I30, the pin I65 will push or strip it from that surface.

Means is provided for holding the master sheet and bringing it into aposition wherein it may be grasped by the clamping member I30. Thismeans preferably comprises an inclined table 200 formed of sheet metal.Secured to the bottom surface of the table 200 are bracket members I and202, the bracket member 202 being shown only in Fig. l and being similarin construction to the bracket member 20I exceptfor the fact that thebracket member 20I has an extension 203 (Fig. 3). The bracket members20I a. shaft 206 mounted in the side frames 20 and 2 I.

Projecting upwardly from the bracket members 20I and 202 through slotsin the table 200 are bearing members 209 and 2I0, respectively. A shaft2I2 is rot-atably journaled in the bearing members 209 and 2I0 and has aplurality of levers 2I4 journaled on it. Rotatably journaled on the freeends of thelevers 2I4 are knurled rollers 2I5. Pins 2I1 projecting fromthe levers 2I4 are engageable with pins 2I8 projecting from,

the shaft 2I2. Springs 220 wound around the shaft 2I2 yieldinglyurge-the levers 2I4 in a counter-clockwise direction (Figs. 3 and 4),and tend to hold the pins 2I1 against the pins 2I8.

A. lever 222 is pinned to one end of the shaft 2I2 and is yieldinglyurged in a counter-clockwise direction (Figs. 3 and 4) by a spring 223which has one of its ends secured to the free end of the lever 222 andhas its other end secured to a pin 224 projecting from the frame 20.Displacement of the lever 222 in a counterclockwise direction (Figs. 3and 4) is limited by apin 226 which projects from the frame 20. Theconstruction is such that when the table 200 is in the position whereinit is illustrated 59 in Fig. 4, the pin 226 holds the lever 222, the

shaft 2I2 and the levers 2I4 in positions wherein they hold the knurledrollers 2I5 spaced from the upper surface of the table 200. However,when the table 200 is displaced from the position wherein it is shown inFig. 4 to the position wherein it is shown in Fig. 3, the knurledrollers 2I4 will come into contact with a master sheet placed on theupper surface of the table 200. This engagement of the master sheet bythe 0 knurled rollers 2I5 takes place during the initial movement of thetable. A master sheet is shown at I62 in Fig. 3.

Referring to Figs. 2, 3 and 4, it will be noted that a spring 230 hasone of its ends secured to 5 a pin 23I which projects from the extension203 from the bracket 20I. The other end of the spring 230 is secured toa pin 232 projecting from the side frame 20. The spring 230 tends tohold the table 200 in the position wherein it is shown in full lines inFigs. 2 and 4. Rubber bumpers 235 are secured to the top surface of thebracket 236 which extends between and is secured to the side frames 20and 2I. The bracket 236 is provided with an upwardly extending flange231 against which the forward edge of the master and 202 have holes 205which accommodate sheet comes to rest when it is placed upon the table200. The flange 231 may be called a paper stop or a margin bar.

When a master sheet has been placed upon the table 200 by sliding itonto the table 200 beneath the shaft 2I2 and the knurled rollers 2I5'until its forward edge abuts against the flange 231, the operator maytilt the table 200 at any desired time thereafter to bring it from theposition wherein it is shown in Fig. 4 to the position wherein it isshown in Fig. 3. When the table 200 is brought into the position whereinit is shown in Fig. 3, a lug 240 projecting from the bracket member 20Iis engaged by a pawl 24I and the table 20I is retained in the positionwherein it is shown in Fig. 3 until the pawl 24I is displaced to releasethe lug 240. The pawl 24I is pivoted intermediate its ends on a pin 242projecting from the side frame 20. At its upper end, the pawl 24I isprovided with a pin 244 which is engageable by a pin 245 projecting froman arm 246 of a bell crank lever 241 which has a second arm 248. Thebell crank lever 241 is secured to a pin 250 pivoted in the frame 20. Afinger piece 25I is fixed on the outer end of the pin 250 for a purposewhich will presently appear (Fig. 1).

Projectingfrom the arm 248 is a pin 253 which is engageable with a camplate 254 riveted to the cam member I54. A spring 255 has one of itsends secured to a pin 255 projecting from the arm 246. The other end ofthe spring 255 is secured to a pin 251 projecting from the side frame20. The spring 255 yieldingly urges the bell crank lever 241 in aclockwise direction (Fig. 3).

A spring 259 has one of its ends secured to a pin 260 projecting fromthe cam member I54, the other end of the spring 259 being secured to thepin 251.- The spring 259 yieldingly urges the cam member I54 in acounter-clockwise direction (Fig. 3) around the pin I55.

The pin 260 is engageable with a plate 263 riveted to the inner end ofthe extension 203 on the bracket member 20I.

It will be noted that the pin 244 projects from a flat surface 24mprovided upon the upper end of the pawl 24I. This surface 24Ia. isengageable by the pin 245 as illustrated in Fig. 4 so that the pin 245may displace the pawl 24I in a clockwise direction (Figs. 3 and 4) todisengage the pawl from the lug 240. A spring 24lb yieldingly urges thepawl 24I in a counter-clockwise direction (Figs. 3 and 4).

When the cam member I54, which carries the cam plate 254, moves from theposition wherein it is shown in Fig. 3 to the position wherein it isshown in Fig. 4, the pin 253 and the bell crank lever 241, as well asthe pin 245, are displaced in a counter-clockwise direction (Fig. 4)because the pin 253 rides up on the cam plate 254 until it reaches theposition wherein it is shown in Fig. 4. During the initial movement ofthe pin 253 in its movement over the cam plate 254 to reach the positionwherein it is shown in Fig. 3, the pin 245 engages the surface 24Ia. anddisplaces the pawl 24I so that it becomes disengaged from the lug 240,whereupon the spring 230 displaces the table 200 into the positionwherein it is shown in Fig. 4.

When the operator tilts the table 200 from the position wherein it isshown in Fig. 4 to the position wherein it is shown in Fig. 3, the plate263 displaces the cam member I54 from the position wherein it is shownin Fig. 4 to the position wherein it is shown in Fig. 3 as the plate 263engages and displaces the pin 200 during its final movement. The pin 253then abuts the end of the cam member 254 as illustrated in Fig. 3 5 anda pin 241a projecting from the bell crank lever 241 engages a slidulder20a formed on the frame member 20 so thatthe'spring 255 can not displacethe bell crank leve'r any farther in a clockwise direction (Fig. 3). Itwill be noted that the pawl 2 now holds the table200in the positionwherein it is shown in- Fig. 3.

The master sheet I62 is retained in the position wherein it is shown inFig. 3 by the knurled rollers 2I5 and its forward end projectsinto thepath of the clamping member I30 as illustrated in Figs. 3, 8 and 9. InFig. 3, the drum 32 is not shown but the curvature imparted to theforward end of the master sheet by the drum is shown. This curvature isbest illustrated in Fig. 8.

Referring now to Figs. 8 and 9 wherein the action of the clamping memberI30 is illustrated, it will be noted that the cam member I54 is in thesame position as it is shown in'Fig. 3 and when it is in this position,it lies in the path of V the roller I 52. Then as the drum 32 isrotated. in a clockwise direction (Figs. 8 and 9) the roller I52 ridesup on the cam surface I53 and the lever I41, acting through the rollerI43, displaces the clamping member I 30 from the position wherein it isshown in Fig. 8 to the'position wherein it is shown in Fig. 9. It may besaid that the clamping member is, then open. As the drum 32 continues torotate in a clockwise direction (Figs. 8 and 9) the forward edge of themaster sheet I 62 is received in the groove I38 of the clamping memberI30. Referring to Fig. 9. it will be noted that the roller I52 is inengagement with the pin 245 and is displacing the bell crank lever 241in a clockwise direction Fig. 9) against the action of the spring 255 sothat the pin 253 is being displaced to the left (Fig. 9). Before theclamp I30 can engage the lower end of the. table 200 the pin 253 isdisengaged from theupper end of the cam member 254 and the spring 259displaces the cam I54 from the position wherein it is shown in Fig.9 tothe position wherein it is shown in Fig. 4. The spring displaces the cammember I54 until'it abuts against a stop pin I54w projecting from 5 theframe member 20. Simultaneously with the retraction of the cam lever ormember I54, the I springs I51 retract the clamping member I30 from itsopen position so that the forward edge of the master sheet is clamped tothe drum 32 55 as illustrated in Fig. '1. 4

The master sheets and the copy sheets are discharged from the drum ontoa table 215 having a plurality of bent bars 216 secured to its bottomsurface. The bars 216 engage a rod 211 60 which extends between theframe members 20 a I and 2I. Brackets 219 spot welded to the bottomsurface of the table 215 are secured by screws 280 to a sheet metalhousing member 28I which extends between the frame members 20 and 2|.

Now if it is assumed that there is a master sheet I62 clamped to thedrum 32'and that the table 200' has been brought into the positionwherein it is shown in Fig. 3 with a new master sheet on it, the firstmaster sheet will be discharged from the drum before the clamping memberI30 reaches the position wherein it is shown in Fig. 9 and isengagingthe new master sheet; Thus, it will be noted that in Fig. 8 theroller I52 is about to engage the cam surface I53. 75 When the rolle'r-I52 engages the cam surface I53,

the clamping member I30 opens and the first master sheet isdelivered tothe table 215. Then as the drum continues to rotate, the clamping memberI30 clamps the second master sheet to the drum. As explained above, thepins I65 assist in discharging the flrstmaster sheet from the clampingmember during the replacement of a master sheet. Now if it isassumed'that there is a master sheet clamped to the drum 32 and that theoperator has brought the table 200 into the position wherein it is shownin Fig. 3 with a second master sheet on it, it will be understood C hatif the operator for some reason does not desire tp replace the firstmaster sheet, it is not necessary to first discharge the first mastersheet and then again place it on the table 200 to clamp it again to thedrum as the operator may displace the finger piece 25I angularly todisplace the bell crank lever 241 ina counterclockwise direction (Fig.3) so that the pin 253 will permit the cam I54 to be retracted by thespring 259 and the pin 245 will travel along the surface 24Ia of thepawl 2 and displace the pawl ina' clockwise direction (Fig. 3) againstthe action of the spring 24Ib so that the pawl will release the lug 240,whereupon the spring 230 will'retract the table 200 into the positionwherein it is shown in Fig. 4. The stop pin 244 co-operates with the pm245 to limit the distance the operator can dis- ,place the bell cranklever 241 in a counter-clockwise direction (Fig. 3). When the table 200is returned inthis manner to the position wherein it is shown in Fig. 4,it is obvious that the first master sheet will remain clamped upon thedrum during subsequent rotation thereof.

The copysheets are fed manually to the drum 32 from a feed table 300extending flanges 30I at its sides. The inner ends of the flanges 30Irest in bracket members 302 which aresecured to the frames 20 and 2 I byscrews 303, or the equivalent. The flanges 30I are secured detachably tothe brackets 302 by set screws 304 which may be unscrewed to formed withdownwardly permit withdrawal of the table 300 from the machine. Theinner end of the table 300 is inclined upwardly as best shown in Figs.2, 13 and 14 and this upwardly extending end of the table 300 rests upona sheet metal bracket 301 which is riveted to a bracket 300 extendingbetween the side frames 20 and 2I. It will be noted that the top surfaceof the bracket 308 forms a continuation of the top surface of the feedtable 300 and these surfaces are adapted to guide the copy sheets over aplaten roll 3| 0 into-engagement with a notch 3 formed in thecylindrical surface of the drum 32. The notch 3 provides a shoulderagainst which the forward ends of the copy sheets abut and this shoulderserves as a margin bar. The platen roller 3I0 is preferably formed fromrubber and is mounted on a shaft 3I2 which has its ends journaied vinbearings 3| 3 formed on a bracket 3 which is secured by bolts 3I5 to asleeve 3I6. Rotatably journaled within the sleeve 3I6 is an eccentric3I3 fixed on a shaft 3I9 which is rotatably Journaled in the side frames20 and 2|. At one end the shaft 3I9 is provided with acrank or handle320 whereby the operator may rotate the shaft 3I9 to vary the pressurewith which the platen roller 3I0 bears against the tail in thisapplication.

Means is provided for moistening the copy sheets as they are advancedbetween the drum 32 and the platen roller 3I8. The moistening meanscomprises two levers 322 pivoted upon the shaft II3, the levers beingpivoted between their ends. Springs 323 each have one end secured to oneof the levers 322 and the other end secured to a bracket 324 fixed toone of the frames. The two levers 322 are formed integral with a bracketmember 325, the bracket member 325 being disposed at the upper ends ofthe levers. The

bracket member 325 comprises an angular por'-.

tion 326 which co-operates with a sheet metal housing member 321 toprovide a chamber 328. Disposed in the chamber 328 is a felt pad 329,the bottom surface of which abuts against the inner end of a felt strip338 which projects from the chamber 328. The felt strip extends betweena flange 332 extending from the angular portion 326 and an extension 333on the housing member 321. The outer end of the felt strip 338 isbeveled as at 334 and is'engageable with the copy sheets as they areadvanced between the drum 32 and the' platen roller 3I8.

Pivoted on the housing member 321 are pins 338 to which levers 348 arefixed. The free ends of the levers 348 are engageable with slots 34Iformed in bars 342 fixed to the angular member 326. It will be readilyunderstoodthat the pins 338 may be rotated to disengage the levers 348from the slots 34I so that the operator may, withdraw the housing member321 and the felt members 329 and 338 as a unit from the bracket member325. e

A reservoir or tank 345 extends between and is secured to the sideframes 28 and 2|. Two conduits 341 extend from the tank 345 to thechamber 328. The ends of the conduit entering the chamber 328 arepreferably metallic tubes 348 which have their inner ends projectinginto the felt pad 329. Valve devices 358 control the flow of fluid fromthe tank 345 to the conduits 341. The valves 358 are controlled bylevers 352 and 3520. fixed to a shaft 353 which is journaled in the sideframes 28 and 2| (Figs. 1 and 2). A leve'r 355 has one end pivoted onthe shaft 353 and carries a roller 356 at its free end. The roller 356rides upon. the cam 88 and is adapted to be oscillated thereby. Alsopivoted on the shaft 353 is a plate 358 provided with a bifurcated lug359 engageable by a lever 368 which is pivoted on the lever 352a. A pin362 which projects from the lever 355 rides in a slot 363 formed in. theplate 358. A tension spring 365 has one of its ends secured to the plate358 and has its other end secured to the lever 355. A set screw 318ascrew threaded through a lug on the plate 358 abuts against the upperend of the lever 355.

When the lever 368 engages the bifurcated lug 359 as best shown in Fig.1, oscillation of the lever 355 by the cam 88 causes equal oscillationof the shaft 353 and it, in turn, oscillates the levers 352 and 352a toopen and close the valve devices 358. The construction is such that eachtime the drum is rotated through 360 degrees, the valves 358 are openedtwice. If the lever 368 is withdrawn from the bifurcated lug 359, thelever 355 will not oscillate the shaft 353. Obviously, the operator hascomplete control of 'the flow of fluid to the moistening means.

Referring again to the levers 322 which are best shown in Figs. 1, 2, 13and 14, it will be noted that one of them carries a pin 318 which isengageable by the lever I88, the pin 318 abuts against the lever I88 atall times through the ing this lost motion, the dog 14 gaged from theaction of the springs 323. The distance the lever I88 can be displacedin a clockwise direction (Fig. 14) around the shaft I I3 is limited by afoot 31I formed on the lever I83 and adapted to abut against the topsurface of the bracket 388. This foot 31I also limitsthe distance thelevers 322 can be displaced in a clockwise direction (Fig. 14) by thesprings 323.

The apparatus is constructed so that when a copy sheet is to be fed intothe machine to occupy the position wherein a copy sheet 313 is shown inFigs. 13 and 14, the moistening felt strip 338 is in the positionwherein it is shown in Fig. 13 so that the operator can bring theforward edge of the copy sheet into engagement with the notch 3I I.After the copy sheet has been positioned in this manner and the operatorrotates the crank or lever 92 in the'manner described above, they drum32 is not driven until the lever or crank 92 has beenrotated through 17degrees. Duris disengaged 12 and the lever I88 is displaced angularly ina clockwise direction (Fig. 14) to withdraw the pawl I84 from the lugI86 so that the springs 323 will displace the levers 322 and the leverI88 in a clockwise direction (Fig. 14) to bring the foot I1I intoengagement with the top surface of the lgracket 388. The felt strip 338then engages the top'surface of the copy sheet 313 and is in engagementtherewith when the drum 32 and the platen roller 318 start advancing thecopy sheet between them. This is a feature of the invention.

Briefly, the operation of the machine is as follows: A master sheet isplaced upon the table 288 and the operator tilts the table from theposition wherein it is shown in Fig. 4 to the position wherein it isshown in Fig. 3. The knurled rollers 2I5 retain the master sheet in itscorrect position upon the table so that it will not gravitate down theinclined surface thereof. The operator then rotates the crank or lever92 so that the master sheet will be clamped to the drum 32 by theclamping member I38. It will be noted that it requires two revolutionsof the crank or handle 92 for a complete revolution of. the drum 32..The operator then advances copy sheets one by one to the positionwherein the copy sheet 313 is shown in Fig. 13. Each time a copy sheetis advanced to this position, the operator rotates the crank or lever92. During the initial movement of the crank or lever 92, of each cycleof operation, the dog 14 is disenshoulder 12 and the moistening means isbrought into contact with the upper surface of the copy sheet. As theoperator continues to rotate the crank or lever 92, the drum 32 startsto rotate and it co-operates with the platen roller 3I8 to advance thecopy sheet and to bring the moistened surface thereof into contact withthe master sheet. The volatile solvent on the copy sheet dissolves someof the ink on the master sheet so that the data on the master sheet isduplicated on the copy sheet. The copy sheet is then discharged onto thetable 215. After the desired number of copy sheets .have beenduplicated, the master sheet may be discharged automatically from thedrum and replaced by anotherin the manner described above.

A feature of the invention is that the drum comes to a positive stop atthe end of each cycle of operation. Thus, the dog 14 engages theshoulder 12 and positively holds the drum 32 against rotation until thecrank or lever 92 has been rotated through 17 degrees. Such confrom theshoulder.

connected to said shaft whereby it is rotated,

struction is advantageous as compared to detents, or the like, whichpermit continuous rotation of the drum 32.

As pointed out above, the construction of the moistening means isparticularly advantageous as it is in contact with the copy sheetsbefore'they' are drawn between the duplicating drum and the platenroller. This insures the same margin. at the forward end of the paper ineach instance and also enables the machine to be constructed so thatrelatively short margins are provided.

Another feature of the invention is theiconstruction for the means forrotatably mounting the drum 32 between the side frames 20 and 2|. Theconstruction is such that the drum may be removed withlittle'effort.Thus, it is only necessary to unscrew the bolts or pins 26 and 21 and topermit the spacing'collar 40 to drop out of its place adjacent the frame20, whereupon the drum 32 can be shifted longitudinally a short distanceto the left (Figs. 6 and 11) and lifted bodily from its position betweenthe side frames. Referring again to the slot 60 in the lever 59 and thebolt 6| which secures the drum 32 ad- 5 justably to the lever 59, thisconstruction is advantageous as it permits one to'vary the augu larposition of thedrum 32 with respect to the other mechanism of themachine. Thus, one may rotate the drum: 32 relative to the lever 59 tobring the notch 3 into any desired position relative to the platenroller 3|!) and the mechanism which is actuated by the various cams,etc. In the preferred embodiment of the invention, it is preferable tohave the radially extending surface ofv the slot or notch. 3H disposedin a plane coincident with the longitudinal axes of the drum 32 and theplaten roller 3| 0. (Fig. 13.) Of course, the notch 3 is only inthisposition when the dog 14' engages the shoulder 12. However, it will bereadily understood that with the dog 14 in engagement with the shoulder12, the drum 32 may be displaced angularly in either direction to bringthe notch 3| l into any desired position relative to the shoulder 12. Itmay be also desirable at times to adjust the drum 32 angularly to have amaster sheet thereon register with certain lines or other markings on,the copy sheets.

As best shown in Figs. 6 and 11, the shaft co-operates with the bolts 26and 21 to function as a tie rod between the frames 20 and 2|. The shaftalso co-operates with the collar to serve as a strut or spacing memberbetween the frame 20 and 2!.

While,we have shown and'described certain embodiments of our invention,it is to be understood that it is capable of many modifications.Changes, therefore, in the construction and arrangement may be madewithout departing from the spirit and scope of the invention asdisclosed .in the appended claims, in which it is our intention to claimall novelty inherent in our inventionas broadly as possible, in view ofthe' prior art.

We claim:

1'. In a duplicating 'machine, a rotatable duplicatingdrum, a platenroller co-operating with said duplicating drum, a gear with which saidduplicating drum is constrained to rotate, a.

shaft, a pinion journaled on said shaft and meshing withsaid gear,yielding means operatively connecting said shaft to said pinion, meansfor positively limiting-angular displacement between said shaft and saidpinion, means operatively means for holding said drum against rotationduring a predetermined portion of each cycle of operations, and meansoperatively connected to said shaft for controlling said holding means.

2. In a duplicating machine, a rotatable duplicating drum, a platenroller co-operating with 3. In a duplicating machine, a rotatableduplicating drum, means clamping a master sheet on said drum, a platenroller f 'r pressing copy sheets against said master sheet, said platenroller co-operating with" said duplicating drum to advance said copysheets,'means for locking said duplicating drum against rotation duringa predetermined portion of each cycle of operations, means formoistening said copy sheets, and means for bringing said mbisteningmeans into contact with said copy sheets while said drum is lockedagainst rotation.

4. In a duplicating machine, a rotatable duplicating drum, meansclamping a master sheet on said drum, a platen roller for pressing copysheets against said master sheet, said platen roller cooperating withsaid duplicating drum to advance said copy sheets, means includingyielding means for driving said duplicating drum, means for locking saidduplicating drum against rotation during the initial'operation of saiddriving means during each cycle of operations, means for moistening saidcopy sheets, and means for bringing said moistening means into contactwith said copy sheets while said drum' is locked against rotation andsaid driving means is being operated.

5; In a duplicating machine, a rotatable duplicating drum having acylindrical surface, said cylindrical. surface having a groove extendinglongitudinally thereof, means clamping a master sheet on said drum, aplaten roller for pressing a copy sheets against said master sheet, saidplaten roller cooperating with said duplicating drum to advance saidcopy sheets, means for locking said said duplicating drum, a gear withwhich said duplicating drum is constrained to rotate, a shaft,

a pinion jourrialed on said shaft and meshing with said gear, yieldingmeans operatively connecting said shaft to said pinion, means limitingangular displacement between said shaft and said pinion, a camfixed onsaid shaft, means controlled by said cam for locking said drum againstrotation during a predetermined portion of each cycle of operations,means for clamping a master sheet on said drum, meansfor moistening saidcopy sheets, means for bringing said moistening means into contact withsaid copy sheets, a reservoir for holding the moistening medium, meansincluding a valve operatively connecting said reservoir with saidmoistening means, and means whereby said cam controls said valve,

- '7. In a duplicating machine, a rotatable duplicating drum, meansincluding yielding means for driving said duplicating drum, means forlocking said drum against rotation during a predetermined portion ofeach cycle of operations, means including a cam for controlling saidlocking means, means for securing a master sheet on said drum, means forapplying a solvent to copy sheets as they are brought into contact withsaid master sheet, a reservoir for holding said solvent, a conduitextending from said reservoir to said solvent applying means, and meanscontrolled by said cam for controlling the flow of solvent through saidconduit.

8. In a duplicating machine, a frame, a rotatable duplicating drum, atable from which copy sheets are advanced to said drum, a master sheettable pivoted in said frame, a pawl engageable with said master sheettable to hold one end thereof adjacent said drum, a spring for drawingsaid end of said master sheet table away from said drum, a cam movablymounted on said frame, means actuated by said table for bringing saidcam into its functionally operative position, a spring pressed clamp onsaid drum for securing master sheets thereto, means actuated by said camfor controlling said clamp, and means actuated by said controlling meansfor disengaging said pawl from said master sheet table.

9. In a duplicating machine, a frame, a rotatable duplicating drum, atable from which copy sheets are advanced to said drum, a master sheettable pivoted in said with said master sheet table to hold one endthereof adjacent said drum, 2, spring for drawing said end of saidmaster sheet table away from said drum, a cam movably mounted on saidframe, means actuated by saidtable for bringing said cam into itsfunctionally operative position, a spring pressed clamp on said drum forsecuring frame, a pawl engageable master sheets thereto,

able duplicating drum, a table from which copy sheets are advanced tosaid drum, a master sheet table movably mounted in said frame, a pawlengageable with said master sheet table to hold one end thereof adjacentsaid drum, a spring for drawing said end of said master sheet table awayfrom said drum, a cam movably mounted on said frame, means actuated bysaid table for bringing said cam into its functionally operativeposition, a spring pressed clamp on said drum for securing master sheetsthereto, means actuated by said cam for controlling said clamp, a leveractuated by said controlling means for disengaging said pawl from saidmaster sheet table, and a finger piece whereby said lever is actuatedmanually.

11. In a duplicating machine, a rotatable duplicating drum, a table fromwhich copy sheets are advanced to said drum, means for moistening saidcopy sheets during their movement with said drum, yielding means fordriving said drum, means for holding said drum against rotation during apredetermined portion of each cycle of operations, and means forbringing said moistening means into engagement with the copy sheetswhile the drum is held against rotation.

12. In a duplicating machine, a rotatable duplicating drum, meansclamping a master sheet on said drum, a platen roller for pressing copysheets against said master sheet, said platen roller cooperating withsaid duplicating drum to advance said copy sheets, means for lockingsaid duplicating drum against rotation during a predetermined portion ofeach cycle of operations, means for moistening said copy sheets, andmeans actuated in synchronism with said drum to bring said moisteningmeans into contact with said copy sheets while sa'id drum is lockedagainst rotation.

ROBERT F. MORRISON. MERRITT G. STEWART.

